The 1st, 3rd and 4th terms are 51, 68 and 108 respectively. Find the 2nd term.
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Let the second term be x
51: x:: 68: 108
x×68=51×108
x=51×108/68
x=81
51: x:: 68: 108
x×68=51×108
x=51×108/68
x=81
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